#include <iostream>
#include <string>

using namespace std;




class My_int
{
private:
    int my_int;
public:
    My_int(/* args */)
    {
        my_int = 0;
    }
    My_int(int my_int)
    {
        this->my_int = my_int;
    }

    ~My_int()
    {

    }

    // 声明 友元
    friend void show_int(My_int & my_int);
};


void show_int(My_int & my_int)
{
    cout << my_int.my_int << endl;
}





int main(int argc, char const *argv[])
{
    
    My_int val(100);
    
    show_int(val);
    return 0;
}
